body { margin: 0; padding: 0; font-size: 30px; font-weight: bold }
div { text-align: center; line-height: 50px }
.main { width: 500px; height: 700px; margin: 0 auto }
.left { width: 200px; height: 700px; background: #ccc; float: left }
.right { width: 300px; height: 700px; background: #fcc; float: right }